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Cu-Zn and Cu-Ni Bimetallic Particles Fabricated Using Ascorbic Acid and Its Role in Photodegradation of Methyl Orange
摘要： Chemical reduction of metal salts using ascorbic acid (vitamin C) is a new and green approach in which ascorbic acid serve dual role of reducing and capping agent. Copper, zinc and nickel salts were reduced by ascorbic acid to give bimetallic nanoparticles. SEM images highlight the aggregation of nanoparticles, which is due to the high surface energy of the particles in nano range. Bimetallic particles fabricated are in the weight ratio of 4:1. Subsequent shift of surface plasma resonance band and XRD peaks indicate that the particles are not just a physical mixture of mono metallic particles. UV-visible spectra and XRD result rule out the alloy nature of the particles. Average size of the particles were calculated using XRD data and are in nano scaled. Size of the Cu, Cu-Zn and Cu-Ni particles as calculated by using Scherrer’s equation are 43.47, 38.4 and 43.5 nm, respectively. In this work photo degradation of methyl orange has been studied to demonstrate the catalytic properties of mono and bimetallic particles. Bimetallic particles have superior catalytic application as compared to monometallic particles. These alloying of metals might have result in change of certain electronic configuration, which significantly increase the catalytic application of bimetallic nanoparticles.
关键词： Methyl orange,Ascorbic acid,Bimetallic,Catalytic properties
更新于2025-09-23 15:23:52
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Novel I-doped Bi12O17Cl2 photocatalysts with enhanced photocatalytic activity for contaminants removal
摘要： Novel I-doped Bi12O17Cl2 photocatalysts have been synthesized using a facile chemical precipitation method and characterized by XRD, XPS, SEM, BET and UV–vis DRS etc. The corresponding results indicate that I- ions enter into the crystal lattices of Bi12O17Cl2 and replace partial Cl- ions form an impurity level over valence band and extend the visible light absorption ranges of Bi12O17Cl2. I-doped Bi12O17Cl2 exhibits much superior visible-light (λ > 420 nm) photocatalytic activity to that of the pure Bi12O17Cl2 in the methyl orange (MO) and phenol degradation, because a little amount of I- ions can boost the photocharges separation efficiency, which is ensured by photoluminescence spectra, transient photocurrent responses and electrochemical impedance spectra. It is expected that this work opens a new potential pathway to improve the photocatalytic activity of non-stoichiometric ratios bismuth oxyhalide via ions doping strategy.
关键词： B. Chemical synthesis,C. Electrochemical measurements,D. Catalytic properties,A. Semiconductors
更新于2025-09-19 17:15:36
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Controlled Hydrothermal Synthesis of Bismuth Vanadate Nano-articulate Structures: Photooxidation of Methicillin Resistant Staphylococcus aureus and Organic Dyes
摘要： Scheelite monoclinic bismuth vanadate nano-articulate crystals have been synthesized by using 1% sodium dodecyl sulphate as surfactant and ammonia as pH controlling agent at 180?C for 4 hr (at pH = 0, 1, 3, 6 and 8) under facile hydrothermal conditions. The products were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), UV-Vis spectroscopy, field emission scanning electron microscopy (FE-SEM) and energy dispersive X-ray spectroscopy (EDS). XRD and FE-SEM confirm the formation of monoclinic structures at all pH ranges and a preferential crystal growth (crystallite size 20-30 nm) has been observed along {040} facet with increase in NH4OH concentration. This selective growth resulted in structure enhanced performance of photocatalytic degradation of organic dyes and bacterial inactivation. Photocatalytic inactivation of methicillin resistant Staphylococcus aureus (MRSA) and comparison of the results to the oxidation of Procion Red MX-5B, Alizarin Red S and Cibacron Brilliant Yellow 3G-P dyes using bismuth vanadates has been reported originally in this paper.
关键词： Nano-articulate crystals,MRSA inactivation,Catalytic properties,Preferential growth
更新于2025-09-16 10:30:52
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Multifunctional p‐Type Carbon Quantum Dots: a Novel Hole Injection Layer for High‐Performance Perovskite Light‐Emitting Diodes with Significantly Enhanced Stability
摘要： Excess electrons from intrinsic oxygen vacancies play a key role in the surface chemistry and catalytic properties of metal oxides. This effect in actinide dioxides is particularly critical (AnO2), the most common nuclear fuels, where radiation can induce the formation of vacancies. However, the behavior of excess electrons on AnO2 surfaces has not been fully explored. In this article, we present a first-principle study of the electronic structure of excess electrons from oxygen vacancies on AnO2 (111) surfaces (An = Th, U, Pu). The low-energy solutions for the excess electrons are searched via U-ramping and occupation matrix control. The excess electrons are found to localize at the vacancy site on ThO2 and move to the metal 5f orbitals on the PuO2 surface, with UO2 as the intermediate case. This change significantly affects the catalytic properties of the AnO2 surfaces. In the presence of water, the excess electrons lead to the exothermic splitting of H2O and formation of molecular H2 on ThO2 and UO2 surfaces, while on the PuO2 surface the formation of H2 is thermodynamically unfavorable. This work has vital implications in the surface chemistry and corrosion of AnO2 and hence the handling and long-term storage of spent nuclear fuels.
关键词： oxygen vacancies,catalytic properties,nuclear fuels,excess electrons,actinide dioxides,water splitting
更新于2025-09-11 14:15:04
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CdS nanoparticles sensitized high energy facets exposed SnO2 elongated octahedral nanoparticles film for photocatalytic application
摘要： The fabrication of well-defined semiconductor based SnO2 heterostructure is still a great challenge. In this study, SnO2(TiO2) elongated octahedral nanoparticles film was directly produced on FTO substrate by hydrothermal approach and TiCl4 post-treatment. As a light absorber, CdS nanoparticles were assembled onto the TiCl4-treated SnO2 elongated octahedral nanoparticles (SnO2(TiO2)). We investigated the photocatalytic and photoelectrochemical properties of the prepared SnO2(TiO2)/CdS(6) heterostructure showed much higher photocatalytic activities for the degradation of the methyl orange (MO) under visible light irradiation in comparison with individual SnO2(TiO2) film photocatalyst. The significantly enhanced photocatalytic performance of the SnO2(TiO2)/CdS(6) sample is due to the absorption of visible light and the formation of type-II heterostructure, which plays a role in the effective charge separation. Moreover, these SnO2(TiO2)/CdS films photocatalyst are directly produced on FTO substrates, making the photocatalyst collection and recycling easier than the powders photocatalyst.
关键词： SnO2,CdS,Electrochemical properties,Heterostructure,Catalytic properties
更新于2025-09-10 09:29:36